John Deere 002019.09 – ICU: SSU Message Missing

A fault has been detected in the communication of the CAN BUS message within the Main Control Module. The Instrument Control Unit (ICU) logs this code when it fails to receive expected data from the Steering System Unit (SSU) over the CAN bus network. This communication breakdown can affect the proper exchange of data between systems, leading to operational disruptions in the tractor's steering and other integrated systems.

• 7030 Series
• 7630
• 7730
• 7830
• 7930
• 8030 Series
• 8130
• 8230
• 8330
• 8430
• 8530
• 9030 Series
• 9230
• 9330
• 9430
• 9530
• 9630
• 8020 Series
• 8120
• 8220
• 8320
• 8420
• 8520
• 6020 Series
• 6320
• 6420
• 6R Series
• 7R Series
• 8R Series
• 9R Series

1. 1

   Check fuse F23, which supplies power to the SSU

2. 2

   Visually inspect the wiring harness and connectors between the ICU and the SSU for corrosion, damage, or loose connections (especially behind the cab)

3. 3

   With the harness unplugged from the SSU, verify unswitched power at the corresponding pin to check for breaks or high resistance

4. 4

   Check CAN bus voltages (CAN High and CAN Low should both read approximately 2.5 volts DC to ground)

5. 5

   Isolate the controller by unplugging individual controllers from the CAN bus one at a time to see if the SSU is shorting out the network

1. 1

   Confirm the fault

   Using a diagnostic tool or the tractor's onboard display, confirm that ICU 002019.09 is the active fault code.

2. 2

   Check and replace fuse

   Locate and inspect fuse F23. Replace it if it is blown. If intact, proceed to the next step.

3. 3

   Access the SSU

   Locate the Steering System Control Unit (SSU), which is typically found on the back side of the cab.

4. 4

   Inspect and test wiring

   Disconnect the electrical harness from the SSU. Check for power and ground at the connector pins. Pay special attention to the unswitched power wire, which is prone to corrosion and breaking within the harness conduit.

5. 5

   Repair wiring

   If a broken or corroded wire is found, repair it using appropriate splicing and sealing techniques to prevent future moisture intrusion.

6. 6

   Test the SSU

   If wiring and power supply are good, connect a known good SSU (if available) to verify if the original controller is faulty.

7. 7

   Replace and program SSU

   If the SSU is determined to be the cause, replace it. The new controller may require programming or calibration by a John Deere dealer.

8. 8

   Clear codes and verify

   After repairs, clear all diagnostic trouble codes. Start the tractor and verify that ICU 002019.09 does not return and the SSU is communicating.